What are the maximum values of the output frequency and the sampling frequency? Where is written in datasheet about it?
The AD5391 is a DAC so there is no sampling frequency as such. If you want to generate a sinewave for example, the maximum frequency depends on how fast you can write the digital codes to the DAC, how many channels you are changing and the settling time of the output.
The settling time is 3us typical for a half scale step. This would allow a 333Khz signal. If the output needs to change more than a half scale step then the max frequency would be lower.
You can write to each channel at a speed of 24 x 33ns +50ns = 1.187MHz
Can you give more details of your requirements and I can give a more full answer?
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